/*
 * Copyright (C) 2012 scchang <scchang@caltech.edu>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package ogame.utilities.datastorage.subtables;

import com.almworks.sqlite4java.SQLiteConnection;
import com.almworks.sqlite4java.SQLiteException;
import com.almworks.sqlite4java.SQLiteStatement;
import ogame.utilities.Constants;

/**
 *
 * @author scchang <scchang@caltech.edu>
 */
public class GeneralTable {

    /**
     * Connection for current database.
     */
    protected SQLiteConnection db;
    
    ///////////////////////////////////////////////////////////////////////////
    /**
     * Constructs and initialize a new general table interface.
     * @param db, Already opened db
     */
    public GeneralTable(SQLiteConnection db){
        this.db = db;
        this.intializeGeneralTable();
    }
    
    ///////////////////////////////////////////////////////////////////////////
    /**
     * Initializes the general table within the member database.
     */
    protected void intializeGeneralTable(){
        // Simple inject
        String sql_inject = "CREATE TABLE IF NOT EXISTS General (";
        for(int i = 0; i < Constants.DATA_STORAGE_GENERAL_COLS.length; ++i){
            sql_inject += " " + Constants.DATA_STORAGE_GENERAL_COLS[i];
            if(i < Constants.DATA_STORAGE_GENERAL_COLS.length - 1){
                sql_inject += ",";
            }
        }
        sql_inject += ")";
        
        try{
            this.db.exec(sql_inject);
        }catch(SQLiteException e){
            e.printStackTrace();
            System.out.println("Unable to create general table.");
        }
    }
    
    ///////////////////////////////////////////////////////////////////////////
    /**
     * Gets the next player id from the general table.
     * @return, the next player id, otherwise -1
     */
    public int getNextPlayerID(){
        String sql_inject = "SELECT max_player_id FROM General";
        try{
            SQLiteStatement st = this.db.prepare(sql_inject);
            
            if(st.step()){
                int max_player_id = st.columnInt(0);
                return max_player_id + 1;
            }else{
                // this means that there is nothing in the table, insert new
                this.db.exec("INSERT INTO General VALUES (0, 0)");
                st.dispose();
                return 1;
            }
        }catch(SQLiteException e){
            e.printStackTrace();
            System.out.println("Unable to find next player id.");
            return -1;
        }
    }
    
    public boolean incrementPlayerID(){
        try{
            int nextID = this.getNextPlayerID();
            
            if(nextID == -1){
                System.out.println("Unable to get next id.");
                return false;
            }
            
            SQLiteStatement st = this.db.prepare("UPDATE General SET max_player_id=?1 "
                    + "WHERE max_player_id=?2");
            st.bind(1, nextID);
            st.bind(2, nextID-1);
            
            st.step();
            st.dispose();
            return true;
        }catch(SQLiteException e){
            e.printStackTrace();
            System.out.println("Unable to increment player id.");
            return false;
        }
    }
    
    ///////////////////////////////////////////////////////////////////////////
    /**
     * Gets the next planet id from the general table.
     * @return, the next planet id, otherwise -1.
     */
    public int getNextPlanetID(){
        String sql_inject = "SELECT max_planet_id FROM General";
        try{
            SQLiteStatement st = this.db.prepare(sql_inject);
            
            if(st.step()){
                int max_planet_id = st.columnInt(0);
                st.dispose();
                return max_planet_id + 1;
            }else{
                // This means that there is nothing in the table, insert new
                this.db.exec("INSERT INTO General VALUES (0, 0)");
                st.dispose();
                return 1;
            }
        }catch(SQLiteException e){
            e.printStackTrace();
            System.out.println("Unable to find next planet id.");
            return -1;
        }
    }
    
    ///////////////////////////////////////////////////////////////////////////
    /**
     * Increments the planet id that is stored in the general table.
     * @return, If the increment was successful.
     */
    public boolean incrementPlanetID(){
        try{
            int nextID = this.getNextPlanetID();
            
            if(nextID == -1){
                System.out.println("Unable to get next id in crement planet id.");
                return false;
            }
            
            SQLiteStatement st = this.db.prepare("UPDATE General SET max_planet_id=?1 "
                    + "WHERE max_planet_id=?2");
            st.bind(1, nextID);
            st.bind(2, nextID-1);
            
            st.step();
            st.dispose();
            return true;
        }catch(SQLiteException e){
            e.printStackTrace();
            System.out.println("Unable to increment Planet ID.");
            return false;
        }catch(IllegalStateException e){
            e.printStackTrace();
            System.out.println("Unable to perform insertion.");
            return false;
        }
    }
}
